7228-BCBM bearing: complete specifications & equivalents

Specification table

Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-27

Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.

Cross references & equivalents

Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.

How the 7228-BCBM model number is decoded

7228 BCBM is SKF's 140 mm-bore single-row angular-contact ball bearing in the 7200 series, nominal 40° (B) contact angle, 140×250×42 mm to the ISO dimension plan. 40° contact angle (suffix B): the steep standard single-row angle, giving the highest axial capacity at the cost of speed, with a recommended load ratio Fa/Fr ≥ 1. machined brass cage, ball-centred (suffix M), the choice for high speed, marginal lubrication and shock duty. CB means universally matchable with Normal axial internal clearance: the two side faces are ground so any two units form DB (back-to-back), DF (face-to-face) or DT (tandem) sets without regrinding. Envelope 140×250×42 mm (5.512×9.843×1.654 in), 55.0 mm radial section height, C 199 kN, C0 212 kN, Pu 6.4 kN.reference speed 3,000 r/min (thermal) and limiting speed 3,600 r/min (mechanical), catalogue mass 8850 g. Mass and section check: 8850 g inside the 140×250×42 mm outline leaves a 55.0 mm radial section, and the 212 kN static rating is 1.07× the dynamic rating — plan static safety and minimum load against those numbers rather than against sister executions. The 6.4 kN fatigue load limit is the equivalent-load floor for long-life adjustment; with 199/212 kN ratings and 8850 g mass this execution carries about 1.42 kN of C per millimetre of bore. Bore-to-OD planning: OD 250 over bore 140 is a 1.79× step for this size, and the 42 mm width gives a bore/width ratio of 3.33; use these ratios when housing space around the 140 mm shaft is the first constraint. Non-optimized universal execution: BCBM keeps the earlier internal geometry (no E) with CB Normal-clearance set mounting and a machined brass ball-centred cage; it is stocked for positions built around its established ratings rather than the enhanced E ball complement.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Fillet radii must clear the chamfer so the 42 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
• Do not mix execution classes inside one set: a universally matchable BCBM unit is ground for arbitrary pairing, a basic execution is not.
• Keep the load ratio in the SKF design range: Fa/Fr ≥ 1 for this angle; below it the balls unload the contact ellipse and skid, which is why the catalogue insists on a minimum axial load (Fam ≈ A·(n·dm/1000)²) at high speed.
• Greased positions should fill roughly 25–35 % of the free volume on a 7228-BCBM of this section and route the surplus past the outer ring; overpacking churns the grease and reproduces the thermal preload problem mechanically.
• The steep 40° angle of 7228-BCBM favours thrust-heavy combined loads; for a predominantly radial high-speed position the 25° ACCBM execution of the same size is the alternative order number.
• Universally matchable BCBM bearings arrive ready for set mounting, not preloaded sets: preload results from how the set is clamped, so follow the SKF stand-off-ring and nut-torque procedure.